Fluid motor



G. C. SMITH FLUID MOTOR May 23, 1933.

Filed Sept. 2, 1930 INVENTOR. 6F GZB'WIZZZ,

I TTORNEY 1.

Patented May 23, 1933 PATENT OFFICE GROVER- 0. SMITH, 01 LOS ANGELES, GALIFOBiNIA FLUID MOTOR Application filed September 2, 1930. Serial No. 479,309.

This invention relates to fluid motors and more especially to hydraulic .motors.

It'is an ob ect of the present invention to provide a highly efficient and simple prime mover of a 'type including a reciprocating piston and a diflerential valve device combined therewith, whereby to efl'ect the exhaust of 'the motor fluid automatically in rapid intermittent actions.

A further object issto provlde a combined shearing mechanism and fluid motor.

The invention consists in certain advancementsin this art as set forth in the ensuing \r disclosure and: having with the above, additional objects and advantages, and whose construction, combination and details of means, and the manner of operation will be made manifest in the description-of the herewith illustrative embodiment; it bein understood that modifications, variations an adaptations may be resorted to within the scope, principle and spirit of the invention as it is more directly claimed hereinafter. Figure 1 is an axial section of the motor I as combined with blade devices of a clipper.

Figure 2 is an axial section of the motor piston and itsautomatic valve. I

In its illustrated form, the invention includes a cylinder 2 .to one side of which is 3 connected a motive fluid inlet 3controlled by a regulating-valve 4; this being shown in the present case as connected to a garden hose 5 for the supply of water under available pressure to the motor.

One end of the cylinder is closed by an exhaust head 6, having a series ofexhaust ports '7 from which may extend a drain line A 8. The opposite end of the cylinder is provided with a guide bushing 9 fora piston rod 10, whose inner end carries a piston ring '11, snugly operating in the cylinder 2, The piston rod 10 is yieldingly thrust inward-by a main spring 12, surrounding the piston rod. v A ;The piston rod is hollow and receives the. end of a valve rod 13, which is threaded to receive adjustable lock-nuts 14 normally held in intermediate position in the bore ofthe piston rod by a. cushion spring 15, and

' a compression spring 16, hearing against a therefor, a piston rod working in one end of valve disc 18 away from its seat 19. As this occurs, the accumulated fluid from the inlet 3 will escape through the exhaust outlets 7 and because of the loss of pressure of the motive fluid, the valve 18 will be again seated and the main sprin 12 will force the piston 11 inwardly until the valve 18, being closed, pressure will again accumulate and force the piston rod outward until the valve 18 is agaln open As an example of utility of this motor, a stationary clipper blade 20 is shown as fixed to the cylinder 2 in a position parallel to its axis and a reciprocating clipper blade 21 is fixed to a backbone piece 22, which is pivotally connected at 23 to the outer end of the piston end so as to be reciprocated there- 'by, so long as motive fluid is admitted to the motor. v

What is claimed is: 80

A fluid pressure and spring motor includinga cylinder, fluid inlet and outlet ports the cylinder and having a piston head, and

a valve rod working in the opposit end of the cylinder and having a valve moving in the cylinder chamber to .close the outlet ports, and double actioncushion means con-' necting the valve rod to'the piston so as to carry the valve rod with the piston .substan-j tially throughout. its strokes back and forth, said means ncluding a shoulder on the rod portion' in the piston part'and compressed springs seating in thlolxpiston art and on opposite sides of the shoul er.

GROVERJC. SMITH. 

